JP2000352111A - Anchoring member for reinforcing steel bars for concrete members - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] An anchoring member used in a construction in which a concrete member is laterally surrounded by a reinforcing bar or the like to reinforce the concrete member. Provide what is. A plurality of steel rods (3) surrounding a concrete member (5) at right angles to the longitudinal direction thereof, and a steel or cast iron angle joint (2) passing two crossing tips of the steel rods. 2) and a nut (4) screwed to the tip of a steel rod
Thus, the fixing member (1) was formed. The length of the steel rod (3) is approximately the same as the lateral width of the concrete member (5) along which it is located. The angle joint (2) breaks at the same angle as the corner of the concrete member along which it is located. The tip of the steel rod (3) is inserted into the insertion hole (17) provided in the end plate (14) on both sides of the angle joint (2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member for fixing a reinforcing member surrounding a concrete member from the outside to reinforce the concrete member.

[0002]

2. Description of the Related Art Reinforcing concrete members from the outside with steel materials such as reinforcing steel at right angles to the longitudinal direction to reinforce existing concrete reinforced concrete members having insufficient shear strength, prestressed concrete members, etc.
Or, to implement seismic reinforcement of existing viaduct columns and reinforced concrete columns on viaduct platforms.

[0003] In the shear strength reinforcement work, a reinforcing steel material surrounding a concrete member is welded or provided with a hook and fixed, and the outer periphery of the reinforcing steel material is wrapped with mortar for rust prevention and deterioration prevention. In many cases, seismic retrofitting only restrains corners of reinforced concrete columns, but the work involves placing angle irons at the four corners of reinforced concrete columns.
A threaded bar is passed between the angle irons, and both ends of the threaded steel are fastened and fixed to the angle iron, and the angle iron and the threaded steel are subjected to rust prevention treatment.

[0004]

However, the conventional fixing has the following problems. 1. When a steel material is fixed by welding, the use of fire not only limits the construction site, but also takes time for the welding operation and lengthens the construction period. 2. When a hook is provided on a steel material for fixing, the thickness of the concrete member is greatly increased by the hook. 3. Since the time-consuming rust prevention and deterioration prevention treatment is performed on site, the construction period becomes longer. 4. In the case of seismic reinforcement that restricts only the corners of reinforced concrete columns, not only does the mortar form filling the gap between the column side surface and the inner surface of the angle iron not only increase in size due to the placed steel rods, but also increase construction costs. In narrow spaces, construction becomes difficult or impossible. 5. In the case of aseismic reinforcement of reinforced concrete columns with elevated walls between the bridge columns, not only does the removal of the walls for construction become large and the construction cost increases, but also after the construction, the ends of the steel rods Because it protrudes from the angle iron, the use of the space under the overpass is limited.

An object of the present invention is to solve these problems, and an object of the present invention is to provide a fixing member of a reinforcing steel bar used for reinforcing a concrete member.
It is an object of the present invention to provide a product capable of shortening a construction period, reducing construction costs, and performing construction in a narrow space.

[0006]

In order to achieve the above-mentioned object, a means adopted by the present invention is to provide a fixing member for a reinforcing steel bar used for a method of surrounding and reinforcing a concrete member.
A steel rod extending along the outer surface of the concrete member in a direction perpendicular to the longitudinal direction thereof, and two outer surfaces forming a corner portion of the concrete member are brought into contact with each other, and two steel bars are attempted to intersect at both end surfaces. An angle joint provided with an insertion hole into which a tip portion to be inserted is loosely fitted, and a nut screwed into a steel rod tip screw portion inserted through the insertion hole of the angle joint.

[0007] As the steel rod, it is preferable to use a threaded steel bar which does not require threading at the tip portion, but it is also possible to use a PC steel bar, a polished steel bar, etc. with the tip portion threaded in advance. it can. When the steel rod has an angle shape along the side surface forming the corner of the concrete member, an angle guide is interposed between the steel rod and the corner of the concrete member. It is desirable that the overall length of the steel bar be substantially equal to the width of the side of the concrete member along which the steel bar extends.

The angle at which the angle guide and the angled steel bar are bent is adjusted to the angle of the corner of the concrete member. The angle joint has at least two of an angled upper and lower surface plate portion and an inner surface plate portion, and both end plate portions integral with these are perpendicular to the side surface of the concrete member along which the angle joint is formed. The fixing member is used as follows. First, a predetermined portion of the concrete member is surrounded by a threaded reinforcing rod, the tips of the two steel rods to be crossed are passed through the insertion holes of the angle joint, and then a nut is screwed into the tip thread to tighten. The steel rod is fixed to the concrete member together with the angle joint.

An angle joint, a steel bar,
Nuts are relatively lightweight and compact as a single unit, and can be manufactured to factory specifications and subjected to rust-proofing. it can. Therefore, the construction period is shortened,
Construction costs are reduced. In addition, construction is possible even in a narrow space. In addition, since the end of the threaded reinforcing rod surrounding the concrete member does not protrude, the final mortar finish is also simplified.

Since the tensile load of the steel rod is received by the concrete member, there is no possibility that the fixing member is damaged. Since the axis of the steel bar surrounding the concrete member of the fixing member is located on the same plane, there is no possibility that the fixing member is twisted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on an embodiment in which the present invention is applied to a reinforced concrete column under an overpass. FIG. 1 is a front view showing the state of construction of a reinforced concrete column under an overpass, FIG.
Is an enlarged sectional view, and FIG. 3 is a front view of the angle joint. As shown in FIG. 1, walls 6 are installed on both sides of a reinforced concrete column 5 under an elevated structure, and are used as a store or an office. A part of the wall 6 along the reinforced concrete column 10 is removed for the seismic reinforcement work. A large number of fixing members 1 are attached to the concrete column 5 so as to be arranged vertically at equal intervals.
The angle joint 2 and the straight threaded reinforcing bar 3 of the anchoring member 1 surround the reinforced concrete column 5 at right angles to its vertical longitudinal direction.

As shown in FIGS. 2 and 3, the reinforced concrete column 5 has a square cross section, and the fixing member 1 comprises four angle joints 2 arranged at four corners of the reinforced concrete column 5.
, Four straight threaded reinforcing bars 3 extending between the angle joints, and eight nuts 4 screwed to both ends of the threaded reinforcing bars. If necessary, use double nuts.

The angle joint 2 is an angle-shaped upper surface plate portion 11 which is bent at a right angle, the lower surface plate portion 12 thereof, and an angle-shaped inner surface plate portion 13 which is in contact with two side surfaces forming the corners of the reinforced concrete column 10. , An end plate part 14 forming both end faces, and an outer plate part 15 having a large opening 16 in the middle. The both end face plate portions 14 have insertion holes 17 through which the threaded bar 3 passes.

Fixing members 1 on both sides of reinforced concrete column 5
The threaded reinforcing bar 3 is passed through the insertion hole 17 of the fixing member 1 and the nut 4 is inserted into the both ends of the threaded bar through the opening 16 of the fixing member 1. When tightened, the threaded reinforcing rod 3 together with the fixing member 1 is fixed to a predetermined portion of the reinforced concrete column 5. In this way, the reinforced concrete columns 5 are reinforced by being surrounded by the numerous fixing members 1. Since the four threaded reinforcing bars 3 are at the same horizontal level, and the reinforced concrete columns have sufficient horizontal strength even if deformed, the earthquake resistance of the elevated structure is improved.

The angle joint 2, the screw rod 3, and the nut 4 as a single unit constituting the fixing member 1 are relatively light and small, and are manufactured so that they are not required to be processed and treated on site at a factory. Due to the rust treatment, construction on site is quick and easy, and the time and cost of reinforcement work are greatly reduced. Further, the space occupied by the fixing member 1 around the reinforced concrete column 5 is small, and since the tip of the threaded reinforcing bar 3 does not protrude to the outer peripheral portion, construction is possible even in a narrow space, and the wall 6 along the reinforced concrete column 5 can be constructed. The mortar frame of the final finish can be easily assembled. Further, the space under the overpass is not limited by the fixing member after the construction is completed.

[0016]

Next, a description will be given of an embodiment using an angle type screw reinforcing bar. As shown in FIG.
Are angle joints 2 arranged at two corners on one diagonal of a reinforced concrete column 5 having a square cross section, and angle guides 8 arranged at two corners on the other diagonal.
And two angled threaded steel bars 7 which are bent at a right angle in contact with the angle guide, and four nuts 4 for connecting both ends of the angled threaded steel bars to the angle joint 2. When the nut 4 hung on the end portion of the angle joint 2 passing through the insertion hole is tightened, the fixing member 1 is fixed to the reinforced concrete column 5.

An angle joint 2 of the fixing member 1 shown in FIG.
Are angle-shaped upper and lower plate portions 11, 1 that abut on both side surfaces forming the corners of the reinforced concrete column 5 at the same size.
2 and both end plate portions 14 connected to both ends of the upper and lower plate portions
Consists of As shown in FIGS. 4 and 6, the angle guide 8 has an angle shape that bends at a right angle when viewed from above, and has a vertical cross section whose center is concave toward the inner peripheral side. The bent portion of the angled threaded rebar 7 fits into the recess of the angle guide 8. This embodiment, compared to the previous embodiment,
Although the weight of the screw rod is the same, the number is half, and the number of nuts and angle joints to be tightened is also half,
A separate angle guide is required. Except for these differences, the configuration and effects of this embodiment are substantially the same as those of the above embodiment.

Although not shown, the angle guide need not be limited to a bent one, but an angle guide is formed from two straight ones, each of which is formed on the side of a concrete member forming a corner. May abut. As shown in FIG. 7, the angle joint 2 includes an angle-shaped inner side surface plate portion 13 that abuts on both side surfaces forming a corner portion of the reinforced concrete column 5, an angle-shaped upper surface plate portion or a lower surface plate portion 12, It is also possible to constitute the both end face plate parts 14 which connected those both ends. In addition, instead of the insertion hole, the insertion groove 1 that is open to the outside is formed in the end face plate portion 14.
8 may be provided to facilitate the insertion of the screw reinforcing rod 3.

If necessary, as shown in FIG. 8, the outer face plate portion 15 of the angle joint 2 may be formed in an arc shape to round the joint. Further, as shown in FIG. 9, the upper and lower plate portions 11, 12 of the angle joint 2 may be formed in a W shape to reduce the volume. As an example, a fixing member applied to a concrete member having a square cross section, which is composed of four straight screw reinforcing bars, four angle joints, and four nuts, and two screws Although a bar composed of a reinforcing bar, two angle joints, two angle guides, and two nuts is shown, the present invention is not limited to the above-described embodiment, and a straight screw bar is used. It can be applied to concrete members with a polygonal cross section other than square by appropriately setting the length of the angle, the length and bending angle of the angled threaded reinforcing bar, and the bending angle of the angle joint and the angle guide. Not even.

If necessary, an angle joint in which two or three angle joints arranged vertically in FIG. 1 are integrally connected, and two or three angle joints arranged in the longitudinal direction of the concrete member.
The steel bars may be connected to one angle joint.

[0021]

As described above, the anchoring member of the present invention used for the reinforcement of the shear strength or the seismic reinforcement of the concrete member intersects with the straight type and / or the angle type threaded steel bar surrounding the cross section of the concrete member. An angle joint that inserts the two ends of the threaded rod to be screwed, and an angle guide that contacts the angled threaded rod,
And a nut screwed into the tip of the threaded bar.
The length of the threaded bar is approximately equal to the lateral width of the concrete member along which it extends, and the angle of the angled threaded bar, angle joint and angle guide is the same as the corner of the corner of the concrete member along which it extends. Since it is manufactured in a factory and subjected to rust prevention treatment, it has many excellent effects as follows. 1. Since each unit constituting the fixing member is relatively light and small, it can be transported manually, and is suitable for construction in a narrow space such as under an overpass. 2. The work on the construction site is only assembling, and cutting with a tool does not require welding, rust prevention treatment, etc., so the construction is easy, the construction period is shortened, and the construction cost is reduced. 3. Since the fixing member surrounding the concrete member has a relatively small thickness and the tip of the threaded bar does not protrude outward, the working space is small and mortar finishing is easy. 4. The increase in size due to the reinforcement of the concrete member that has reinforced the insufficient shear strength can be relatively small. 5. In seismic retrofitting of reinforced concrete columns under elevated structures, the size of the removal area for construction is reduced, and temporary construction costs are reduced.

[Brief description of the drawings]

FIG. 1 is a front view of an under-elevated reinforced concrete column using a fixing member according to an embodiment of the present invention,

2 is a cross-sectional view of the reinforced concrete column of FIG. 1,

FIG. 3 is an enlarged front view of the angle joint of FIG. 1;

FIG. 4 is a view corresponding to FIG. 2 of another embodiment,

FIG. 5 is an enlarged front view of the angle joint of FIG. 4;

FIG. 6 is a perspective view of the angle guide of FIG. 4;

FIG. 7 is an enlarged front view of an angle joint according to still another embodiment;

FIG. 8 is an enlarged front view of an angle joint according to another embodiment;

FIG. 9 is an enlarged plan view of an angle joint according to still another embodiment;

[Explanation of symbols]

 1: Fixing member 2: Angle joint 3: Screw rebar (straight) 4: Nut 5: Reinforced concrete column 6: Wall 7: Screw rebar (angle) 8: Angle guide 11: Upper plate 12: Lower plate 13: Inner surface plate portion 14: End surface plate portion 15: Outer surface plate portion 16: Opening 17: Insertion hole 18: Insertion groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Tsuyoshi 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Masashi Kobayashi 2-2-2 Yoyogi, Shibuya-ku, Tokyo No. Tohoku Japan Railway Company (72) Inventor Shigenobu Ohashi 520 Yokokura Nitta, Oyama City, Tochigi Prefecture Tokyo Steel Co., Ltd. (72) Inventor Toshihiro Iwasaki 520 Yokokura Nitta, Oyama City, Tochigi Pref.

Claims (4)

[Claims] 1. A steel or cast iron through which a plurality of steel rods (3, 7) surrounding a concrete member (5) orthogonal to the longitudinal direction thereof and through which two crossing tips of said steel rods are passed. An angle joint (2) and a nut (4) to be screwed into the threaded end of the steel rod, and the length of the steel rod is substantially the same as the side width of the concrete member along which the steel rod extends.
The angle joint is bent at the same angle as the corner of the concrete member along which the angle joint extends, and the threaded end of the steel rod is inserted into the insertion hole (1
7) A fixing member for a reinforcing member for reinforcing a concrete member, wherein the fixing member is inserted through the insertion groove (18). 2. The concrete bar according to claim 1, wherein said at least one steel bar is an angle-shaped steel bar which is bent at the same angle as a corner of said concrete member along which said steel bar extends. The fixing member for reinforcing a reinforcing member for concrete member according to claim 1, wherein an angle guide (8) made of steel or cast iron is provided between the corner and the corner. 3. The angle joint comprises an angle-shaped upper plate (11), a lower plate (12), and an inner surface plate (13).
The fixing member for reinforcing a reinforcing member for a concrete member according to claim 1, wherein two or three of the above are integrally provided. 4. An anchoring member for a reinforcing member for reinforcing a concrete member according to claim 3, wherein said angle joint is integrally provided with an outer plate portion (15) having a center opening.